poisonous; toxic.
a poison.

1880–85; < Medieval Latin toxicant- (stem of toxicāns), present participle of toxicāre to poison. See toxic, -ant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
toxicant (ˈtɒksɪkənt)
1.  a toxic substance; poison
2.  a rare word for intoxicant
3.  poisonous; toxic
[C19: from Medieval Latin toxicāre to poison; see toxic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

toxicant tox·i·cant (tŏk'sĭ-kənt)

  1. A poison or poisonous agent.

  2. An intoxicant.

Poisonous; toxic.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Next they exposed the cells to a mitochondrial toxicant.
The hazmat team was after a smoking gun--some volatile toxicant that might yet
  be lurking in the air of the emergency room.
In this study, caffeine was found to act as both a repellent and toxicant
  against slugs and snails.
Atrazine was developed as a new reference toxicant for use in evaluating the
  consistency of the culture method.
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